A trove of internal Valve files has reportedly leaked online. Data miners combing through it say the haul includes a Portal 2 beta leak, a near complete 2009 build of the puzzle game that predates its final release.
The leak began circulating on Saturday from an unknown source and reportedly totals 12 terabytes. The files span a ten year period, from 2003 to 2013, and cover builds and assets from multiple Valve projects, including Counter-Strike: Global Offensive and Left 4 Dead.
Screenshots and secondhand accounts have documented the 2009 build for years, though a complete, playable copy has never surfaced publicly before now. If the files check out, they would let modders and preservationists study the scrapped test-chamber sequencing directly for the first time. Past accounts have relied on developer commentary and old promotional material.
What’s reportedly in the Portal 2 beta leak
The 2009 build differs from the finished game in several ways. Pre-recorded messages from GLaDOS, rather than Wheatley, guide players through the early test chambers. Other personality cores also appear far more often throughout the level design. A team of beta researchers and enthusiasts spent four years building a mod that recreates this early version of the game, released independently of the leak and without access to the original files.
Valve-focused YouTuber Gabe Follower reports that the cache also contains the Weaponizer, an unfinished weapon previously linked to Half-Life 2: Episode 3.
A possible Half-Life 2: Episode 3 weapon
Information about the Weaponizer first surfaced in a separate 2011 leak, inside a folder labelled “ep3”. Footage resembling the weapon later appeared in Valve’s 20th anniversary documentary on Half-Life 2, according to Gamerant. Neither leak has offered a complete picture of how the weapon would have functioned in the cancelled episode. Concept art and design fragments tied to Half-Life 2: Episode 3 have surfaced in pieces over the past decade. Valve shelved the project indefinitely after shifting focus to other titles.
Other files in the leaked Valve cache
Beyond the Portal 2 beta leak, the files also reportedly include material from F-STOP, a cancelled puzzle game that predates Portal 2. Known internally as “Aperture Camera,” F-STOP was in development for around a year before Valve shelved the project. Its central mechanic let players take photographs and place them as three-dimensional objects in the world. That idea resembles the one later used in the 2023 game Viewfinder. Data miners say the leak does not include a working build of F-STOP, only files and assets tied to it.
Data miners have linked the leak to Valve’s Steam2 content-server infrastructure. The company replaced Steam2 with SteamPipe in March 2013, matching the most recent files found in the archive. Steam2 was Valve’s original content-delivery backend, used to distribute game files before the company migrated to the more efficient system that still underpins Steam today. Valve has not commented publicly on the leak.